Speaker
Takuya Okawa
Description
A flux of photons (from e.g. supernova remnants) with a frequency equivalent to one-half of the axion mass, can induce the decay of nonrelativistic axion dark matter into two photons. Half of the photons produced in the decays generate a potentially detectable 'gegenschein' radio signal traveling in the opposite direction. We take into account that, in addition to a smooth halo distribution, a fraction of the axionic dark matter might be in the form of compact objects known as axion stars. We discuss how, as a result, the gegenschein signal might be enhanced.
Authors
Takuya Okawa
Francesc Ferrer
(Washington University in St Louis)
Bhupal Dev
(Washington University in St. Louis)
